Move Multiple marker with their live location at my end - ios

Question

I am building an application where I have to move multiple marker. These markers will be visible at my end according to the multiple user's live locations. I am able to update only a single marker. but the rest are not updating. I stored these data in firebase and I am getting their data from there.
override func viewDidLoad() {
super.viewDidLoad()
Database.database().reference().child("users").observe(.childChanged, with: { (snapshot) in
if let dictionary = snapshot.value as? [String: AnyObject]
{
self.hideHUD()
self.latitudeFloatValue = (dictionary["lat"] as! Double)
self.longitudeFloatValue = (dictionary["long"] as! Double)
self.moveMent.delegate = self
//set old coordinate
self.oldCoordinate = CLLocationCoordinate2DMake(self.latitudeFloatValue, self.longitudeFloatValue)
print(self.oldCoordinate)
// Create a GMSCameraPosition that tells the map to display the marker
let camera = GMSCameraPosition.camera(withLatitude: self.latitudeFloatValue, longitude: self.longitudeFloatValue , zoom: 14)
self.mapView = GMSMapView.map(withFrame: CGRect.zero, camera: camera)
self.mapView.isMyLocationEnabled = true
self.mapView.delegate = self
self.view = self.mapView
// Creates a marker in the center of the map.
self.driverMarker = GMSMarker()
self.driverMarker.position = self.oldCoordinate!
self.driverMarker.icon = UIImage(named: "car")
self.driverMarker.map = self.mapView
self.copyCordinates = self.cordinates
print(self.copyCordinates)
print(self.cordinates)
self.cordinates = ["lattitude":self.latitudeFloatValue,"longitude":self.longitudeFloatValue]
print("self.cordinates",self.cordinates)
print(self.oldCordinates)
print(self.newCordinates)
if(self.oldCordinates["lattitude"] == nil)
{
self.oldCordinates = self.cordinates
self.newCordinates = self.cordinates
}
self.newCordinates = self.cordinates
self.oldCordinates = self.copyCordinates
print("oldCordinates",self.oldCordinates)
print("newCordinates",self.newCordinates)
self.movinfMarker()
}
}, withCancel: nil)
//for use in background
self.locman.requestAlwaysAuthorization()
locman.requestWhenInUseAuthorization()
if (CLLocationManager.authorizationStatus() == CLAuthorizationStatus.authorizedWhenInUse || CLLocationManager.authorizationStatus() == CLAuthorizationStatus.authorizedAlways){
guard let currentLocation = locman.location else {
return
}
stringLatitude = currentLocation.coordinate.latitude
stringLongitude = currentLocation.coordinate.longitude
print(currentLocation.coordinate.latitude)
print(currentLocation.coordinate.longitude)
}
// Create a GMSCameraPosition that tells the map to display the marker
let camera = GMSCameraPosition.camera(withLatitude: stringLatitude, longitude: stringLongitude , zoom: 7)
self.mapView = GMSMapView.map(withFrame: CGRect.zero, camera: camera)
self.mapView.isMyLocationEnabled = true
self.mapView.delegate = self
self.view = self.mapView
Database.database().reference().child("users").observe(.childAdded, with: { (snapshot) in
if let dictionary = snapshot.value as? [String: AnyObject]
{
self.latitudeFloatValue = (dictionary["lat"] as! Double)
self.longitudeFloatValue = (dictionary["long"] as! Double)
self.titleMarker = (dictionary["username"] as! String)
self.uuidValue = (dictionary["uuid"] as! String)
self.states = [
State(name: self.titleMarker, uuid: self.uuidValue, long: self.longitudeFloatValue, lat: self.latitudeFloatValue),
]
}
for state in self.states {
// Creates a marker in the center of the map.
let state_marker = GMSMarker()
state_marker.position = CLLocationCoordinate2D(latitude: state.lat, longitude: state.long)
state_marker.icon = UIImage(named: "car")
state_marker.title = state.name
state_marker.userData = state.uuid//zIndex = Int32(state.uuid)!
state_marker.snippet = "Hey, this is \(state.name)"
state_marker.map = self.mapView
self.markerDict[state.name] = state_marker
}
}, withCancel: nil)
}
func movinfMarker(){
driverMarker.map = nil
let oldCoodinate: CLLocationCoordinate2D? = CLLocationCoordinate2D(latitude: self.oldCordinates["lattitude"] ?? 0.0 , longitude: self.oldCordinates["longitude"] ?? 0.0)
let newCoodinate: CLLocationCoordinate2D? = CLLocationCoordinate2D(latitude: self.newCordinates["lattitude"] ?? 0.0 , longitude: self.newCordinates["longitude"] ?? 0.0)
print("oldCordinatesNewWala",oldCoodinate as Any)
print("newCordinatesNewWala",newCoodinate as Any)
driverMarker.icon = UIImage(named: "car")
mapView.camera = GMSCameraPosition.camera(withTarget: newCoodinate!, zoom: 17)
driverMarker.groundAnchor = CGPoint(x: CGFloat(0.5), y: CGFloat(0.5))
driverMarker.position = oldCoodinate ?? CLLocationCoordinate2D(latitude: 0.0,longitude: 0.0)
//this can be old position to make car movement to new position
driverMarker.map = mapView
//marker movement animation
CATransaction.begin()
CATransaction.setValue(Int(2.0), forKey: kCATransactionAnimationDuration)
CATransaction.setCompletionBlock({() -> Void in
self.driverMarker.groundAnchor = CGPoint(x: CGFloat(0.5), y: CGFloat(0.5))
//New bearing value from backend after car movement is done
})
driverMarker.position = newCoodinate ?? CLLocationCoordinate2D(latitude: 0.0,longitude: 0.0)
//this can be new position after car moved from old position to new position with animation
driverMarker.map = mapView
driverMarker.groundAnchor = CGPoint(x: CGFloat(0.5), y: CGFloat(0.5))
//found bearing value by calculation
CATransaction.commit()
}